Jobs was referring to traditional computer form factors, not tablets.
It helps if you consider the context of that keynote speech he was giving: he was launching some new Macs and discussing the new multi-touch trackpad features they were introducing to OS X.
Note: "OS X", not "iOS".
OS X is a desktop computer OS that still sticks pretty closely to the traditional WIMP desktop metaphor, with windows and (relatively) tiny widgets designed for clicking on with a precise pointing device like a mouse or trackpad. Those GUI elements are generally too small for pointing at accurately with a finger. (Yes, there are doubtless some people with very thin, sharp, pointy fingers, but "some" people is not "most" people.)
Apple's iDevices proved popular because iOS' GUI was designed *from the ground up* for touch-based interaction. OS X, Windows, KDE and GNOME were not. Any attempts to nail touchscreen features onto those will inevitably result in a compromise.
Yes, Intel, I see your hand raised: what is it?
"Please, sir! OS X might not be designed for touchscreen use, but Windows 8 has that new 'Metro' touch-based UI!"
Bingo! And THAT is what Intel will have been running on their prototype touch-screen "ultrabooks" for their focus groups to play with.
Jobs was right in October 2010. Nobody anyone cared about was offering a touch-screen desktop OS back then, and the MacBook Air line was still in its infancy. Times change. Technologies change. OS X has gone for multi-touch touch pads, rather than touch screens; Windows 8 is going for an untried chimeric approach: part WIMP, part touch-screen. Whether that will actually prove successful is anybody's guess, but I suspect Windows 8's touch screen features may take a while to catch on with the laptop and desktop set.